<?php
namespace framework\ext;

class Zip
{
    protected $datasec = array();
    protected $ctrl_dir = array();
    protected $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
    protected $old_offset = 0;
    
    protected $total_files = 0;
    protected $total_folders = 0;
    
    public function compress($zip_filename='cp.zip', $dir='./', $path_replace='')
    {
        if (function_exists('gzcompress')) {
            $filelist = $this->GetFileList($dir);

            if (count($filelist)>0) {
                foreach ($filelist as $filename) {
                    if (is_file($filename)) {
                        $fd = fopen($filename, "r");
                        $content = fread($fd, filesize($filename));
                        fclose($fd);
                        $this->addFile($content, str_replace($path_replace, '', $filename));
                    }
                }
                $out = $this->file();
                $fp = fopen($zip_filename, "w");
                fwrite($fp, $out, strlen($out));
                fclose($fp);
                return true;
            }
        }

        return false;
    }


    public function decompress($zip_filename='cp.zip', $dir='./')
    {
        $index = array(-1);
        $ok = 0;
        $zip_fp = @fopen($zip_filename, 'rb');
        if (!$zip_fp) {
            return false;
        }
                
        $cdir = $this->ReadCentralDir($zip_fp, $zip_filename);
        $pos_entry = $cdir['offset'];
            
        if (!is_array($index)) {
            $index = array($index);
        }
        for ($i=0; $index[$i];$i++) {
            if (intval($index[$i])!=$index[$i]||$index[$i]>$cdir['entries']) {
                return false;
            }
        }
        for ($i=0; $i<$cdir['entries']; $i++) {
            @fseek($zip_fp, $pos_entry);
            $header = $this->ReadCentralFileHeaders($zip_fp);
            $header['index'] = $i;
            $pos_entry = ftell($zip_fp);
            @rewind($zip_fp);
            fseek($zip_fp, $header['offset']);
            if (in_array("-1", $index)||in_array($i, $index)) {
                $stat[$header['filename']]=$this->ExtractFile($header, $dir, $zip_fp);
            }
        }
        fclose($zip_fp);
        return $stat;
    }
    private function GetFileList($dir)
    {
        $file=array();
        if (file_exists($dir)) {
            if (substr($dir, -1) != "/") {
                $dir .= "/";
            }

            
            $dh = opendir($dir);
            while ($files = readdir($dh)) {
                if (($files!=".")&&($files!="..")) {
                    if (is_dir($dir.$files)) {
                        $file = array_merge($file, $this -> GetFileList($dir.$files));
                    } else {
                        $file[]= $dir.$files;
                    }
                }
            }
            closedir($dh);
        }
        $file[] = '';
        return $file;
    }

    private function unix2DosTime($unixtime = 0)
    {
        $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);
        if ($timearray['year'] < 1980) {
            $timearray['year'] = 1980;
            $timearray['mon'] = 1;
            $timearray['mday'] = 1;
            $timearray['hours'] = 0;
            $timearray['minutes'] = 0;
            $timearray['seconds'] = 0;
        }
        return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) |
    ($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
    }

    private function addFile($data, $name, $time = 0)
    {
        $name = str_replace('\\', '/', $name);
        $dtime = dechex($this->unix2DosTime($time));
        $hexdtime = '\x' . $dtime[6] . $dtime[7]
        . '\x' . $dtime[4] . $dtime[5]
        . '\x' . $dtime[2] . $dtime[3]
        . '\x' . $dtime[0] . $dtime[1];
        eval('$hexdtime = "' . $hexdtime . '";');
        
        $fr = "\x50\x4b\x03\x04";
        $fr .= "\x14\x00"; // ver needed to extract
        $fr .= "\x00\x00"; // gen purpose bit flag
        $fr .= "\x08\x00"; // compression method
        $fr .= $hexdtime; // last mod time and date
        
        // "local file header" segment
        $unc_len = strlen($data);
        $crc = crc32($data);
        $zdata = gzcompress($data);
        $c_len = strlen($zdata);
        $zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
        $fr .= pack('V', $crc); // crc32
        $fr .= pack('V', $c_len); // compressed filesize
        $fr .= pack('V', $unc_len); // uncompressed filesize
        $fr .= pack('v', strlen($name)); // length of filename
        $fr .= pack('v', 0); // extra field length
        $fr .= $name;
        
        // "file data" segment
        $fr .= $zdata;
        
        // "data descriptor" segment (optional but necessary if archive is not
        // served as file)
        $fr .= pack('V', $crc); // crc32
        $fr .= pack('V', $c_len); // compressed filesize
        $fr .= pack('V', $unc_len); // uncompressed filesize
        
        // add this entry to array
        $this -> datasec[] = $fr;
        $new_offset = strlen(implode('', $this->datasec));
        
        // now add to central directory record
        $cdrec = "\x50\x4b\x01\x02";
        $cdrec .= "\x00\x00"; // version made by
        $cdrec .= "\x14\x00"; // version needed to extract
        $cdrec .= "\x00\x00"; // gen purpose bit flag
        $cdrec .= "\x08\x00"; // compression method
        $cdrec .= $hexdtime; // last mod time & date
        $cdrec .= pack('V', $crc); // crc32
        $cdrec .= pack('V', $c_len); // compressed filesize
        $cdrec .= pack('V', $unc_len); // uncompressed filesize
        $cdrec .= pack('v', strlen($name)); // length of filename
        $cdrec .= pack('v', 0); // extra field length
        $cdrec .= pack('v', 0); // file comment length
        $cdrec .= pack('v', 0); // disk number start
        $cdrec .= pack('v', 0); // internal file attributes
        $cdrec .= pack('V', 32); // external file attributes - 'archive' bit set
        
        $cdrec .= pack('V', $this -> old_offset); // relative offset of local header
        $this->old_offset = $new_offset;
        
        $cdrec .= $name;
    
        $this->ctrl_dir[] = $cdrec;
    }

    private function file()
    {
        $data = implode('', $this -> datasec);
        $ctrldir = implode('', $this -> ctrl_dir);
        
        return
        $data .
        $ctrldir .
        $this -> eof_ctrl_dir .
        pack('v', sizeof($this -> ctrl_dir)) .
        pack('v', sizeof($this -> ctrl_dir)) .
        pack('V', strlen($ctrldir)) .
        pack('V', strlen($data)) .
        "\x00\x00";
    }

    
    //下面是zip解压部分
    protected function ReadFileHeader($zip)
    {
        $binary_data = fread($zip, 30);
        $data = unpack('vchk/vid/vversion/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len', $binary_data);

        $header['filename'] = fread($zip, $data['filename_len']);
        if ($data['extra_len'] != 0) {
            $header['extra'] = fread($zip, $data['extra_len']);
        } else {
            $header['extra'] = '';
        }

        $header['compression'] = $data['compression'];
        $header['size'] = $data['size'];
        $header['compressed_size'] = $data['compressed_size'];
        $header['crc'] = $data['crc'];
        $header['flag'] = $data['flag'];
        $header['mdate'] = $data['mdate'];
        $header['mtime'] = $data['mtime'];

        if ($header['mdate'] && $header['mtime']) {
            $hour=($header['mtime']&0xF800)>>11;
            $minute=($header['mtime']&0x07E0)>>5;
            $seconde=($header['mtime']&0x001F)*2;
            $year=(($header['mdate']&0xFE00)>>9)+1980;
            $month=($header['mdate']&0x01E0)>>5;
            $day=$header['mdate']&0x001F;
            $header['mtime'] = mktime($hour, $minute, $seconde, $month, $day, $year);
        } else {
            $header['mtime'] = time();
        }

        $header['stored_filename'] = $header['filename'];
        $header['status'] = "ok";
        return $header;
    }

    protected function ReadCentralFileHeaders($zip)
    {
        $binary_data = fread($zip, 46);
        $header = unpack('vchkid/vid/vversion/vversion_extracted/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len/vcomment_len/vdisk/vinternal/Vexternal/Voffset', $binary_data);

        if ($header['filename_len'] != 0) {
            $header['filename'] = fread($zip, $header['filename_len']);
        } else {
            $header['filename'] = '';
        }

        if ($header['extra_len'] != 0) {
            $header['extra'] = fread($zip, $header['extra_len']);
        } else {
            $header['extra'] = '';
        }

        if ($header['comment_len'] != 0) {
            $header['comment'] = fread($zip, $header['comment_len']);
        } else {
            $header['comment'] = '';
        }

        if ($header['mdate'] && $header['mtime']) {
            $hour = ($header['mtime'] & 0xF800) >> 11;
            $minute = ($header['mtime'] & 0x07E0) >> 5;
            $seconde = ($header['mtime'] & 0x001F)*2;
            $year = (($header['mdate'] & 0xFE00) >> 9) + 1980;
            $month = ($header['mdate'] & 0x01E0) >> 5;
            $day = $header['mdate'] & 0x001F;
            $header['mtime'] = mktime($hour, $minute, $seconde, $month, $day, $year);
        } else {
            $header['mtime'] = time();
        }
        $header['stored_filename'] = $header['filename'];
        $header['status'] = 'ok';
        if (substr($header['filename'], -1) == '/') {
            $header['external'] = 0x41FF0010;
        }
        return $header;
    }

    protected function ReadCentralDir($zip, $zip_name)
    {
        $size = filesize($zip_name);

        if ($size < 277) {
            $maximum_size = $size;
        } else {
            $maximum_size=277;
        }
    
        @fseek($zip, $size-$maximum_size);
        $pos = ftell($zip);
        $bytes = 0x00000000;
    
        while ($pos < $size) {
            $byte = @fread($zip, 1);
            $bytes=($bytes << 8) | ord($byte);
            if ($bytes == 0x504b0506 or $bytes == 0x2e706870504b0506) {
                $pos++;
                break;
            }
            $pos++;
        }
    
        $fdata=fread($zip, 18);
    
        $data=@unpack('vdisk/vdisk_start/vdisk_entries/ventries/Vsize/Voffset/vcomment_size', $fdata);
    
        if ($data['comment_size'] != 0) {
            $centd['comment'] = fread($zip, $data['comment_size']);
        } else {
            $centd['comment'] = '';
        }
        $centd['entries'] = $data['entries'];
        $centd['disk_entries'] = $data['disk_entries'];
        $centd['offset'] = $data['offset'];
        $centd['disk_start'] = $data['disk_start'];
        $centd['size'] = $data['size'];
        $centd['disk'] = $data['disk'];
        return $centd;
    }

    protected function ExtractFile($header, $to, $zip)
    {
        $header = $this->readfileheader($zip);
    
        if (substr($to, -1)!="/") {
            $to.="/";
        }
        if ($to=='./') {
            $to = '';
        }
        $pth = explode("/", $to.$header['filename']);
        $mydir = '';
        for ($i=0;$i<count($pth)-1;$i++) {
            if (!$pth[$i]) {
                continue;
            }
            $mydir .= $pth[$i]."/";
            if ((!is_dir($mydir) && @mkdir($mydir, 0777)) || (($mydir==$to.$header['filename'] || ($mydir==$to && $this->total_folders==0)) && is_dir($mydir))) {
                @chmod($mydir, 0777);
                $this->total_folders ++;
            }
        }
    
        if (strrchr($header['filename'], '/')=='/') {
            return;
        }

        if (!($header['external']==0x41FF0010)&&!($header['external']==16)) {
            if ($header['compression']==0) {
                $fp = @fopen($to.$header['filename'], 'wb');
                if (!$fp) {
                    return(-1);
                }
                $size = $header['compressed_size'];
        
                while ($size != 0) {
                    $read_size = ($size < 2048 ? $size : 2048);
                    $buffer = fread($zip, $read_size);
                    $binary_data = pack('a'.$read_size, $buffer);
                    @fwrite($fp, $binary_data, $read_size);
                    $size -= $read_size;
                }
                fclose($fp);
                touch($to.$header['filename'], $header['mtime']);
            } else {
                $fp = @fopen($to.$header['filename'].'.gz', 'wb');
                if (!$fp) {
                    return(-1);
                }
                $binary_data = pack(
                    'va1a1Va1a1',
                    0x8b1f,
                    Chr($header['compression']),
                    Chr(0x00),
                    time(),
                    Chr(0x00),
                    Chr(3)
                );
            
                fwrite($fp, $binary_data, 10);
                $size = $header['compressed_size'];
        
                while ($size != 0) {
                    $read_size = ($size < 1024 ? $size : 1024);
                    $buffer = fread($zip, $read_size);
                    $binary_data = pack('a'.$read_size, $buffer);
                    @fwrite($fp, $binary_data, $read_size);
                    $size -= $read_size;
                }
        
                $binary_data = pack('VV', $header['crc'], $header['size']);
                fwrite($fp, $binary_data, 8);
                fclose($fp);
    
                $gzp = @gzopen($to.$header['filename'].'.gz', 'rb') or die("Cette archive est compress閑");
                if (!$gzp) {
                    return(-2);
                }
                $fp = @fopen($to.$header['filename'], 'wb');
                if (!$fp) {
                    return(-1);
                }
                $size = $header['size'];
        
                while ($size != 0) {
                    $read_size = ($size < 2048 ? $size : 2048);
                    $buffer = gzread($gzp, $read_size);
                    $binary_data = pack('a'.$read_size, $buffer);
                    @fwrite($fp, $binary_data, $read_size);
                    $size -= $read_size;
                }
                fclose($fp);
                gzclose($gzp);
        
                touch($to.$header['filename'], $header['mtime']);
                @unlink($to.$header['filename'].'.gz');
            }
        }
    
        $this->total_files ++;
        return true;
    }
}
